JPS583441A - Data highway device - Google Patents

Abstract

PURPOSE:To stabilize the switching action between using and spare loops, by using a control loop which is separately prepared. CONSTITUTION:In order to know the state of the loop connection, a switch SW3 of a control loop L3 is switched to a state shown by dotted lines from a state shown by 1-dot chain lines and a general loop controller 13 is connected to the loop L3. A control signal shown in the figure (a) is transmitted to a control circuit 16 of the loop L3 from a monitor device 11 via the loop L3. This control signal recognizes that the using loop is equal to a loop 1 and the working mode of the using loop is N meaning the normal state. At the same time, a node part 10-0 feeds a constitution request to the device 11. Then a changeover switch SW2 is changed to an ON state shown by the dotted lines in order to have a connection to a spare loop L 2. As a result, the controller 13 is connected to the loop L2, and the signal of the loop L2 is transmitted to a control circuit 15 of the loop L2 via a receiver R2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data highway system, and more particularly to a data highway system using optical cables as a transmission system, in which switching control at nodes can be performed with less loss of information.

Conventionally, in data highway equipment, in order to improve throughput (the amount of information that a processor can process in a unit of time), a clock component is included in the data that is sent out serially, and the receiving side extracts this clock component to process the received signal. A method for determining polarity is adopted. With this method, when configuring two transmission loops, one for use and one for backup, the device for reproducing and relaying data in each node section configuring the loop guarantees the continuity of data in the loop. Therefore, it was necessary to operate the device without relaying the data transmission and without a power outage.

For example, Fig. 1 shows a conventional data highway system, which is composed of two transmission loops 1 and 2, a working and backup transmission loop, and terminal devices T and N are connected to the node sections Nd, Nd, and so on. For example, the transmission loop 1 is used as the working loop, the transmission loop 2 is used as the protection loop 2, and the same data can be transmitted in the opposite direction. If the condition of the irregular loop 1 becomes abnormal, the backup loop 2Yt is then used as the working loop. This switching between the working loop and the backup loop was controlled by a monitoring device (monitoring node) Sv. In such conventional systems, power is supplied to the regenerative repeaters of each node using a remote power supply or a battery variation-up method to achieve an uninterrupted state. However, in this method, active elements must be constantly operating, making maintenance difficult and making it difficult to maintain system reliability.

Another method uses mechanically switched optical switches such as mirrors to switch each loop in the node section, but the synchronization of the loops is disrupted when the optical switches are switched, resulting in a large amount of loop information being lost. There were problems such as being forgotten.

In order to solve the problem that a large amount of loop information is lost as described above, the present invention provides a third control loop outside of the active and backup loops, and uses the cough control loop to control the current and backup loops.
It is an object of the present invention to provide a data highway device which performs mutual switching of backup loops, performs data transmission after the operation of the switched loop becomes stable, and controls switching of the loops without loss of information. 0 A data highway device according to the present invention is a data highway device having a working loop and a protection loop, and is provided with a third control loop for controlling the configuration of the loop, and the control loop mutually switches between the working loop and the protection loop. The feature is that the configuration can be changed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FA2 is a principle diagram of the data highway system according to the present invention, FIG. 3 is a block diagram of the overall data highway device of the present invention, and FIG. 4 is a detailed block configuration of the control circuit of the active or protection loop shown in FIG. 5 and 5 respectively show control information patterns used in the data highway device of the present invention.

In FIG. 2, the data highway system according to the present invention has the same working loop L1 backup loop IL! as in the conventional system.
(It goes without saying that when the two are switched, they are reversed and become the backup loop L1 and the working loop L.) In addition to the third loop, that is, the control loop L, is provided. 10 is a node unit to which the terminal device TN is connected, and 11 is a monitoring unit that receives a connection/disconnection request from a specific terminal device TN and sends out loop switching information (loop configuration information). It is a device.

That is, in the method according to the present invention, Li is taken at an appropriate time by the third control loop L3.

It is controlled so that they are exchanged with each other.

Figure M3' is a detailed configuration diagram of FIG. 2 and shows the overall configuration of the embodiment of the present invention.

In the figure, 12 is a switch section, SW.

For example, is the changeover switch for the working loop L, SW is the changeover switch for the backup loop L, SW is the changeover switch for the control loop L, and D, , D, , D are the drivers a, , m of the respective loops. , , )( , , indicates the receiving device of each loop. In addition, each changeover switch sw, ,
When sw, sw, and sw are indicated by dashed lines in Fig. 3, they are in an off state in which the total loop control device 13 and terminal device 17, etc. are opened from the loop, and when they are in a cross-connected state indicated by dotted lines, the total loop is disconnected from the loop. The loop control device 13, terminal device *17, etc. are connected and in an on state. 13 is a total loop control device, 14 is a loop L control circuit, 15 is a loop L2 control circuit, 16 is a control loop L3 control circuit, and 17 is a lower-order device such as a terminal device. In addition, here loop L
.

is the working loop, L! Let us assume that is a preliminary loop.

Now, in Figure 2, 1. A case will be described in which the node section 10-00 is connected to the loops L, -L, in order to add the node section 10-00.

(1) First, in order to know the loose state, control loop L3
Switch SW is switched from the dot-dashed line state to the dotted line state to connect the total loop control device 13 to the control loop L3. This causes control loop L.

The control signal shown in FIG. 5(A) is sent from the monitoring device 11 to the control loop L and the control circuit 16 via the control signal 11. This control signal recognizes that the current loop is loop l and its operating mode is the normal state shown as N. Here, the control information pattern is as shown in Figure 5 (a), and the synchronization character There is a current loop display section outside of , and if either , L, or is currently in use, the operation mode section shows normal state N1 synchronized state S1 loop configuration change T
etc., followed by a check character.

Based on this control information, it is known that the node section t o -Of'i working loop L, is operating in the normal state,
A changeover switch SW sends a configuration change request to the monitoring device 11 and connects to the backup loop L.
Switch to the on state shown by the dotted line.

As a result, the total loop control device 13 becomes the backup loop L.

and the signal of the reserve loop L, is connected to the receiver l(1
, to the Lug L and control circuit 15.

(2) Upon receiving the configuration change request from the node lυ-0, the monitoring device 11 uses a control loop to instruct the operating node 10 to prepare for transition by switching the current loop from loop L1 to loop L. L.

into sync. This is done by setting the operation mode to S in FIG. 85(a). Add this to each 7-do part 10
．． 10 The node section 10 that has been confirmed and newly joined
When synchronization is completed with -0 included, monitoring device 1
1 sequentially prohibits the insertion of new data into the packets in operation, and when this is completed, the control loop Ls is changed to the loop L.
2 is used as the current loop, and the mode is set to 9 operation mode T.

(3) Next, the monitoring device S enables the packet in the loop L, to enable data transfer between each node,
Thereafter, the control loop L3 sets the loop L to the N mode in which it is currently in use. The newly joined node unit 1O-0 detects this control information, turns on the changeover switch SW1, and completes the connection of the loop L. In this case, the control signal is detected by the control loop L3 control circuit 16, thereby causing the control circuit 14 for loop L, or for loop L, to
．． 15 to perform a switching operation from the active loop to the standby loop.

FIG. 4 shows, for example, the control circuit of loop L1 shown in FIG. i, shows the configuration of 4. The mirror control circuit 14 is
That is, a focus sample circuit 100, a clock extraction circuit lot, a serial/parallel conversion circuit 102, a synchronization detection circuit 1
03, a delay circuit 104, a selection circuit 105, and a parallel/serial conversion circuit 106. Here, the clock extraction circuit 101 is a PLL circuit that is activated by being drawn in by the change in the polarity of the serial lator from the loop.It provides a clock for other circuits and provides the best sample timing for the bit sample circuit. Received data is received bit by bit by a sample circuit 100, synchronized with 8-bit character synchronization by a synchronization detection circuit 103, and provided to a lower-order device 17 by a serial/parallel conversion circuit 102 as 8-bit parallel data, for example.

Further, the transmission data from the lower-order device 17 is sent out bit by bit via the parallel/serial conversion circuit tab. This transmission data is selectively transmitted by the selection circuit 105 as either the received data delayed through the delay device t104 or the data transmitted through the parallel/serial conversion circuit 106. Note that in FIG. 4, a delay circuit 104 compensates for delays in control in the lower-order device 17.

As described above, in the data flow system according to the present invention, a working loop and a backup control loop are provided. It is possible to change the loop without any disturbance, and since the operating speed of the switch SW does not need to be high, it is possible to easily change the loop when adding nodes.

Unlike the control circuits of the other loops, the control circuit 16 of the control loop L has a bit rate corresponding to the switching time of the optical switch, so the transmission speed may be slow.
The data transferred is only the data that controls the configuration of the loop.In addition to the control by the control loop L3, the conventional naruf banks (on both sides of the fault point, /j,
Needless to say, it can also be used to prevent cable breakage by reconfiguring the loop by folding back the cable.

[Brief explanation of drawings]

FIG. 1 shows a conventional data highway system, FIG. 2 shows the principle of the data highway system according to the present invention, FIG. 3 shows the overall configuration of the data highway system according to the present invention, and FIG. FIG. 4 shows the configuration of the control circuit of the active or protection loop of FIG. 3, and FIG. 5 shows the control information pattern used in the data highway device of the present invention. In the figure, 1 and 2 are transmission loops, -0-.-#-10 is a node section, 11 is a monitoring device, 12 is a switch section, 13 is a total loop control device, and 14 is a loop L. Reference numeral 15 indicates a control circuit, 15 indicates a loop L, a control circuit, 16 indicates a control loop L, a control circuit, and 17 indicates a lower-order device. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Claims] In a data highway device having a working loop and a protection loop, a third control loop is provided to control the configuration of the loop, and the control loop switches between the working loop and the protection loop. A data highway device characterized in that the data highway device is configured to change the configuration.